Turquoise

 Mohs scale
  5.0 - 6.0
 Specific Gravity
  2.60 - 2.80
 Refractive Index
  1.610 - 1.650
 Crystal system
  Triclinic
 Chemical Composition
  CuAl6(PO4)4(OH)8·4(H2O)

 Sign of Zodiac (Click on the constellation for more information)
 Chakra (Click on the chakra for more information)
 Birthstones (Click on the month for more information)
 
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